Out-of-bounds Read Affecting nss-softokn-freebl package, versions <0:3.53.1-6.amzn2


Severity

Recommended
medium

Based on Amazon Linux security rating

    Threat Intelligence

    EPSS
    0.24% (63rd percentile)

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  • Snyk ID SNYK-AMZN2-NSSSOFTOKNFREEBL-1689226
  • published 27 Sep 2021
  • disclosed 27 May 2021

How to fix?

Upgrade Amazon-Linux:2 nss-softokn-freebl to version 0:3.53.1-6.amzn2 or higher.
This issue was patched in ALAS2-2020-1559.

NVD Description

Note: Versions mentioned in the description apply only to the upstream nss-softokn-freebl package and not the nss-softokn-freebl package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

A flaw was found in the way CHACHA20-POLY1305 was implemented in NSS in versions before 3.55. When using multi-part Chacha20, it could cause out-of-bounds reads. This issue was fixed by explicitly disabling multi-part ChaCha20 (which was not functioning correctly) and strictly enforcing tag length. The highest threat from this vulnerability is to confidentiality and system availability.

CVSS Scores

version 3.1
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NVD

9.1 critical
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    High
  • Integrity (I)
    None
  • Availability (A)
    High
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Red Hat

7.4 high
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SUSE

9.1 critical